Drilling machine



FIG. 1 is a top, front and left-side perspective view of a drilling machine showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a right side elevational view;

FIG. 4 is a bottom plan view;

FIG. 5 is a left side elevational view;

FIG. 6 is a front elevational view; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a drilling machine, as shown or described. 